<script language="javascript">
var strM = "javascript is a good script language";
//在此我想將字母a替換成字母A
alert(strM.replace("a","A"));

</script>
//結(jié)果，它只替換了首字母。但如果加上正則表達(dá)式結(jié)果就不一樣了！replace()支持正則表達(dá)式，它可以按照正則表達(dá)式的規(guī)則匹配字符或字符串，然后給予替換！
<script language="javascript">
var strM = "javascript is a good script language";
//在此我想將字母a替換成字母A
alert(strM.replace(/a/,"A"));
</script>
//但是結(jié)果還是沒有更改，稍加修改就OK了。

<script language="javascript">
var strM = "javascript is a good script language";
//在此將字母a全部替換成字母A,當(dāng)正則表達(dá)式有"g"標(biāo)志時(shí)，代表將處理整個(gè)字符串
alert(strM.replace(/a/g,"A"));
</script>